Merge branch 'master' of https://git.code.sf.net/p/xval/code
Update maths to be (hopefully) correct this time
New sub to compute normals from a grid
fixup
Update epsilon threshold for paging in grid to be less severe, as the grid format on disk doesn't have the same precision as numbers in memory
Re-indent grid::krige at four spaces
Write Vo grid out as ZMAP ASCII when kriging and when saving intermediate files
Bugfix